NCl₃ molecules is pyramidal and BCl₃ molecule is planar because

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B-Cl bond is more polar than N-Cl bond

BCl₃ does not contain unused electron pair while NCI₃does

N-Cl bond is more covalent than B-Cl bond.

Boron atom is smaller than nitrogen atom.

answer is B.

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Detailed Solution

BCl₃ does not contain any lone pair, so it is trigonal planar. NCl₃ has one lone pair of electron. Due to lp-bp repulsion, it acquires pyramidal shape.

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